Journal Article10.1111/J.1365-3040.1991.TB01366.X
How do plant growth substances work? II
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TL;DR: It is concluded that a hormonal concept which includes control by changes in growth substance concentration fails to explain the developmental phenomena under examination and a role for growth substances as integrating agents is suggested and the notion of quantitative tissue sensitivity variation is developed to explainThe major growth patterns of developing shoots.
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Abstract: . Despite intensive research effort, the role of growth substances in the life of the intact growing plant is far from clear. Two reasons are suggested which may account for the lack of progress. The first is the failure to recognize the unique aspects of plant development. These which are expressed by the regenerative, organizational and developmental plasticity of the meristem probably result from the possession of growth substances. The second is the concept of growth substances as hormones. This represents the main conceptual thrust of research and is considered critically, starting with the historical system, the coleoptile and dealing with other major growth substance systems in turn. It is concluded that a hormonal concept which includes control by changes in growth substance concentration fails to explain the developmental phenomena under examination. A role for growth substances as integrating agents is suggested and the notion of quantitative tissue sensitivity variation is developed to explain the major growth patterns of developing shoots.
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References
A quantitative study of auxin and its precursor in coleoptiles
TL;DR: In the course of the investigations it appeared that by combining the diffusion and the extraction technique, other interesting conclusions could be drawn; for instance in regard to the amount of inactive auxin precursor.
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Sensitivity and sensory adaptation in growth substance responses
A. Trewavas
- 01 Jan 1987
TL;DR: Growth substances are sensitive controllers of development only under certain discrete circumstances; in well-nourished plants specific tissues acquire the capability to synthesise growth substances and sensitivity to specific growth substances ontogenetically.
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Periodicity of response to abscisic acid in lateral buds of willow (Salix viminalis L.).
R. S. Barros,S. J. Neill +1 more
TL;DR: Aseptically cultured lateral buds of Salix viminalis L. collected from field-grown trees exhibited a clear periodicity in their ability to respond to exogenous abscisic acid (ABA) and in no cases were the induction and breaking of dormancy and response to ABA correlated with endogenous ABA levels in the buds.
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